Details about ASTM A709/A709M Grade HPS50W Carbon and Low-alloy High-strength Steel Coil

Chemical Composition and Mechanical Properties of ASTM A709 Grade HPS 50W Steel

Chemical Composition:

Element Percentage
C 0.11% Max
Si 0.30-0.50%
Mn 1.10-1.35%
P 0.02% Max
S 0.006% Max
Ni 0.25-0.40%
Cr 0.45-0.70%
Cu 0.25-0.40%
V 0.04-0.08%
Mo 0.02-0.08%

Mechanical Properties:

Property Value
Yield Strength (min) 345 MPa (50 ksi)
Tensile Strength (min) 485 MPa (70 ksi)
Elongation in 200mm (min) 18%
Elongation in 50mm (min) 21%

Applications and Advantages of HPS 50W in Bridge Construction

ASTM A709 Grade HPS 50W steel is primarily used in:

  • Bridge girders and components
  • Highway and railroad bridges
  • Structural members in bridge building

Advantages include:

  • Enhanced toughness and weldability compared to regular Grade 50W
  • Improved atmospheric corrosion resistance
  • Suitable for use in exposed structures without painting

Manufacturing Process and Available Dimensions

HPS 50W is produced using conventional hot-rolling or controlled rolling processes. Available dimensions:

Thickness Width Length
Up to 4 inches (100 mm) 72 to 120 inches (1830 to 3050 mm) Up to 1200 inches (30480 mm)

Comparison of HPS 50W with Other A709 Grades

Grade Yield Strength (min) Tensile Strength (min) Corrosion Resistance
50 345 MPa (50 ksi) 450 MPa (65 ksi) Standard
50W 345 MPa (50 ksi) 485 MPa (70 ksi) Improved
HPS 50W 345 MPa (50 ksi) 485 MPa (70 ksi) Enhanced
HPS 70W 485 MPa (70 ksi) 585 MPa (85 ksi) High Performance

Corrosion Resistance and Weathering Properties

HPS 50W offers enhanced atmospheric corrosion resistance with an ASTM G101 Atmospheric Corrosion Resistance Index of ≥6.0. This makes it suitable for use in exposed structures without painting in many environments.

Welding and Fabrication Considerations for HPS 50W Steel

HPS 50W can be welded with greater ease than many steels developed in the past. It follows standard welding procedures and does not typically require preheating or post-weld heat treatment for most applications.At HL Steel Company, we offer high-quality ASTM A709 Grade HPS 50W steel coils tailored for bridge construction and other structural applications, ensuring optimal performance and durability for your projects.

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